Interstellar Attack: Spincrease Slot Machine - Play Interstellar Attack: Spincrease Slot Free

Introduction

You are a space commander in charge of a fleet of spacecraft charged with repelling an alien attack in Interstellar Attack: Spincrease, an online slot from High 5.

Most of us will look at this slot and be reminded of the classic Space Invaders game created in 1978 by Tomohiro Nishikado. This was the forerunner of all examples of shooter games; the fixed shooter is reflected in this slot. The main difference is that the sixth row of the 5x6 reel set sees battleships fly along and stick in position if the player is lucky.

The game is packed with upgrade features triggered by the green and red crystals, which appear when an asteroid is exploded. The former upgrade the space fleet while the latter provide power-ups with new symbols appearing on the reels.
Players need to look out for an alien scout ship above the reels. Shoot him down, and a bonus feature is activated, which can destroy rows when triggered.

Shooting the scout ship above reel six will start 10 free games, during which the alien ship will not appear above the reels. This means there is no chance to re-trigger free spins.

The free games are played on different reels, with no power-up values; these are awarded randomly on alternate games.
A random multiplier from x2 to x10 is also awarded in this phase of the game, along with other random feature symbols, one of which adds a free game.

Complete the bonus level 1 and players move through another series of levels up to level six. Each level completed engages a multiplier, and these range from x10, x20, x50, x250, x2500 to a maximum x25000 the total bet.

Fans of this designer’s work will find lots more examples of their work in High 5 slot demos to play for free at Slots Temple.

Theme, Graphics and Soundtrack 

We are cruising outer space, encountering aliens who are not too friendly and indeed look scary. As mentioned above, this game reminds players of the fun of Space Invaders, the iconic '70s retro game that some will remember as a land-based slot. 
In this case, the space armada is packed with powerful craft, which are upgraded as the game progresses.

The graphics are cool and definitely 21st-century, with the aliens landing on the reels whilst the space ships fly along the bottom.
In the background galaxies, planets and stars gleam and set the scene for the intergalactic battle.

The soundtrack is pure retro, with the sound of lasers shooting down the enemy or exploding meteorites straight from the game that inspired this slot.

If the space theme appeals to you, why not try the Reactoonz slot, available in demo mode here at Slots Temple? The design is different and more of a cartoon style. as the name suggests, but the game has a solid RTP of 96.51% and is high variance. 

Interstellar Attack: Spincrease RTP and Variance 

Interstellar Attack: Spincrease has an RTP range from 90% to 97.20% in different modes of the game. This has been interpreted by some sites as meaning an average of 94%, but players should be wary of this calculation. We rate the game as being medium variance, but because it is rather complex, players might be advised to take advantage of the bet spread whilst they ease themselves into the game.

How to Play Interstellar Attack: Spincrease

This is a game with complex variations, particularly in terms of where symbols land and how they can add to your bankroll. Here we will try to guide you through this epic space trip.

1. Once the main game loads, click on the “+” button in the top right corner.
2. A menu opens, and you can mute the soundtrack if you find it distracting by clicking on the speaker icon.
3. Next, click on the information button to reveal the rules of the game.
4. Here there are two options. Begin by clicking on the base button to reveal the rules in the initial game.
5. Here you will find a description of the symbols and where they appear on the grid, along with their values.
6. Scroll down to see bonus symbols and multiplier values.
7. Now, click on the bonus game to see how this mode of the slot operates and how free games can be triggered.
8. Return to the main screen, and in the bottom right corner, you can adjust your wager.
9. Above this, you can engage auto spin and customise the feature.
10. You are all set to play; just hit the spin button.

You can play this slot for free here at Slots Temple and familiarize yourself with the game before heading to a casino to play for free.

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Remember that once you're playing for cash, you should set yourself a budget for each session and leave the site when the fun ends.

Bet Sizes and Pay Table Wins 

Bet sizes range from 20 to 4000 and the minimum rewards in the base game for alien symbols are as follows:
Purple Alien = x0.5
Green Alien = x2.5
Blue Alien = x10
Orange Alien = x25

Max-win 28,039x

Volatility Medium

Top RTP 97.20%

Interstellar Attack: Spincrease Free Spins 

Shooting down the Alien Spy Ship above reel 6 will trigger 10 free games with a chance to move through different levels.

Interstellar Attack: Spincrease Review 

This is a great take on a retro game, but it's extremely complex. Players are advised to read the full rules before starting their mission.

Disclaimer: Interstellar Attack: Spincrease trademark / license is owned by High 5. This site is not endorsed by High 5.